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#Import Libraries

library(aplore3)
library(caret)
library(dplyr)
library(tidyverse)
library(car)
require(ggthemes)
library(glmnet)
library(cowplot)
library(GGally)
library(ResourceSelection)
library(ROCR)
library(pROC)
library(doParallel)
library(qwraps2)
cl <- makePSOCKcluster(7)
registerDoParallel(cl)

#Import Data

data = glow_bonemed 
data = data.frame(data)
dim(data)
[1] 500  18
data$sub_id = as.factor(data$sub_id)
data$site_id = as.factor(data$site_id)
data$phy_id = as.factor(data$phy_id)

#Split train and test set

set.seed(66)
trainIndex <- createDataPartition(data$fracture, p = .8, 
                                  list = FALSE, 
                                  times = 1)
train <- data[trainIndex,]
test  <- data[-trainIndex,]
dim(train)
[1] 400  18
dim(test)
[1] 100  18

Objective do EDA and Simple Model

EDA

All of the EDA will be done in the train data

View head of dataframe

head(train)

Looking at Fracture balance

# look for class imbalance
# The dataset is hevaily imbalance with more No's than Yes

data_classes = data %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
train_classes = train %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
test_classes = test %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()

plot_grid(data_classes, train_classes, test_classes, labels = c("Overall Data", "Train Data", "Test Data"))

Let’s look at pair plots from all the numeric variables

train_numeric = train %>% select_if(is.numeric)
pairs(train[,2:8],col=as.factor(train$fracture))

Looking at a different view of pair plots for numerical variables. Excluding id’s

ggpairs(train,columns=4:8,aes(colour=fracture))

Looking at box plot for different numerical variables per fracture or not

boxplot_age = train %>% ggplot(aes(y=age, x=fracture)) + geom_boxplot() + ggtitle("age vs fracture") + theme_fivethirtyeight()

boxplot_weight = train %>% ggplot(aes(y=weight, x=fracture)) + geom_boxplot() + ggtitle("weight vs fracture")  + theme_fivethirtyeight()

boxplot_height = train %>% ggplot(aes(y=height, x=fracture)) + geom_boxplot() + ggtitle("height vs fracture") + theme_fivethirtyeight()

boxplot_bmi= train %>% ggplot(aes(y=bmi, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

boxplot_fracscore= train %>% ggplot(aes(y=fracscore, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

plot_grid(boxplot_age, boxplot_weight, boxplot_height, boxplot_bmi, boxplot_fracscore, nrow=2, ncol=2)

Lets look at bmi vs age per different categorical variables

# relation of bmi and age

age_bim_fracture = train %>% ggplot(aes(x=age, y=bmi, col=fracture)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_premeno = train %>% ggplot(aes(x=age, y=bmi, col=premeno)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_smoke = train %>% ggplot(aes(x=age, y=bmi, col=raterisk)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_raterisk = train %>% ggplot(aes(x=age, y=bmi, col=smoke)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

plot_grid(age_bim_fracture, age_bim_premeno,age_bim_smoke, age_bim_raterisk, nrow=4, ncol=1)

Lets look at different numerica variables vs categorical variables per site id The point os to investigate if site id had any impact

bmi_frac_type = train %>% ggplot(aes(x=fracture, y=bmi, col=as.factor(site_id))) + geom_boxplot() + ggtitle("BMI for fracture type per site id")

age_frac_type = train %>% ggplot(aes(x=fracture, y=age, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Age for fracture type per site id")

weight_frac_type = train %>% ggplot(aes(x=fracture, y=weight, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Weight for fracture type per site id")

height_frac_type = train %>% ggplot(aes(x=fracture, y=height, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Height for fracture type per site id")

plot_grid(bmi_frac_type, age_frac_type, weight_frac_type,height_frac_type, nrow=2, ncol=2)

colnames(train)
 [1] "sub_id"     "site_id"    "phy_id"     "priorfrac"  "age"        "weight"     "height"     "bmi"        "premeno"    "momfrac"    "armassist" 
[12] "smoke"      "raterisk"   "fracscore"  "fracture"   "bonemed"    "bonemed_fu" "bonetreat" 

options(qwraps2_markup = "markdown")
our_summary1 <-
  list("Age" =
       list("min"       = ~ min(age),
            "median"    = ~ median(age),
            "max"       = ~ max(age),
            "mean (sd)" = ~ qwraps2::mean_sd(age)),
       "Weight" =
       list("min"       = ~ min(weight),
            "median"    = ~ median(weight),
            "max"       = ~ max(weight),
            "mean (sd)" = ~ qwraps2::mean_sd(weight)),
       "Height" =
       list("min"       = ~ min(height),
            "median"    = ~ median(height),
            "max"       = ~ max(height),
            "mean (sd)" = ~ qwraps2::mean_sd(height)),
       "BMI" =
        list("min"       = ~ min(bmi),
             "median"    = ~ median(bmi),
                "max"       = ~ max(bmi),
                "mean (sd)" = ~ qwraps2::mean_sd(bmi)),
        "Frac Score" =
        list("min"       = ~ min(fracscore),
             "median"    = ~ median(fracscore),
                "max"       = ~ max(fracscore),
                "mean (sd)" = ~ qwraps2::mean_sd(fracscore))
       )

summary_table(train, our_summary1)
Registered S3 methods overwritten by 'htmltools':
  method               from         
  print.html           tools:rstudio
  print.shiny.tag      tools:rstudio
  print.shiny.tag.list tools:rstudio
train (N = 400)
Age   
   min 55
   median 67
   max 90
   mean (sd) 68.64 ± 8.98
Weight   
   min 39.9
   median 68
   max 124.7
   mean (sd) 71.67 ± 16.28
Height   
   min 134
   median 162
   max 199
   mean (sd) 161.53 ± 6.40
BMI   
   min 14.87637
   median 26.36709
   max 49.08241
   mean (sd) 27.44 ± 5.91
Frac Score   
   min 0
   median 4
   max 11
   mean (sd) 3.73 ± 2.50

our_summary1 <-
  list("Age" =
       list("min"       = ~ min(age),
            "median"    = ~ median(age),
            "max"       = ~ max(age),
            "mean (sd)" = ~ qwraps2::mean_sd(age)),
       "Weight" =
       list("min"       = ~ min(weight),
            "median"    = ~ median(weight),
            "max"       = ~ max(weight),
            "mean (sd)" = ~ qwraps2::mean_sd(weight)),
       "Height" =
       list("min"       = ~ min(height),
            "median"    = ~ median(height),
            "max"       = ~ max(height),
            "mean (sd)" = ~ qwraps2::mean_sd(height)),
       "BMI" =
        list("min"       = ~ min(bmi),
             "median"    = ~ median(bmi),
                "max"       = ~ max(bmi),
                "mean (sd)" = ~ qwraps2::mean_sd(bmi)),
        "Frac Score" =
        list("min"       = ~ min(fracscore),
             "median"    = ~ median(fracscore),
                "max"       = ~ max(fracscore),
                "mean (sd)" = ~ qwraps2::mean_sd(fracscore))
       )

summary_table(dplyr::group_by(train,fracture), our_summary1)
No (N = 300) Yes (N = 100)
Age      
   min 55 56
   median 66 72
   max 90 89
   mean (sd) 67.61 ± 8.84 71.72 ± 8.74
Weight      
   min 39.9 45.8
   median 68 69.15
   max 120.2 124.7
   mean (sd) 71.89 ± 16.53 71.02 ± 15.60
Height      
   min 148 134
   median 162 160
   max 199 178
   mean (sd) 162.09 ± 6.05 159.85 ± 7.10
BMI      
   min 14.87637 18.36349
   median 26.30405 26.4308
   max 49.08241 44.03628
   mean (sd) 27.32 ± 5.94 27.79 ± 5.81
Frac Score      
   min 0 0
   median 3 5
   max 11 9
   mean (sd) 3.37 ± 2.44 4.81 ± 2.39
NA

options(qwraps2_markup = "markdown")
our_summary1 <-
  list("Age" =
       list("min"       = ~ min(age),
            "median"    = ~ median(age),
            "max"       = ~ max(age),
            "mean (sd)" = ~ qwraps2::mean_sd(age)),
       "Weight" =
       list("min"       = ~ min(weight),
            "median"    = ~ median(weight),
            "max"       = ~ max(weight),
            "mean (sd)" = ~ qwraps2::mean_sd(weight)),
       "Height" =
       list("min"       = ~ min(height),
            "median"    = ~ median(height),
            "max"       = ~ max(height),
            "mean (sd)" = ~ qwraps2::mean_sd(height)),
       "BMI" =
        list("min"       = ~ min(bmi),
             "median"    = ~ median(bmi),
                "max"       = ~ max(bmi),
                "mean (sd)" = ~ qwraps2::mean_sd(bmi))
       )

summary_table(train, our_summary1)
train (N = 400)
Age   
   min 55
   median 67
   max 90
   mean (sd) 68.64 ± 8.98
Weight   
   min 39.9
   median 68
   max 124.7
   mean (sd) 71.67 ± 16.28
Height   
   min 134
   median 162
   max 199
   mean (sd) 161.53 ± 6.40
BMI   
   min 14.87637
   median 26.36709
   max 49.08241
   mean (sd) 27.44 ± 5.91

#Functions


fit_pred = function(model, x, y, m){
  if(m=="lasso"){
    fit.pred = predict(model, newx = x, type = "response")
    
  }
  if(m=="lda"){
     fit.pred= predict(model, x, type = "prob")
     fit.pred = fit.pred[,2]
  }
  
  if(m=="rf"){
     fit.pred= predict(model, x, type = "prob")
     fit.pred = fit.pred[,2]
  }
  
  if(m=="stepwise"){
    fit.pred = predict(model, newdata  = x, type = "response")

    
  }
  return(fit.pred)
  
}
make_predictions = function(model, x, y, m){
  
  fit.pred = fit_pred(model, x, y, m)
 
  
  
  results = prediction(fit.pred, y, 
                           label.ordering=c("No","Yes"))
  return(results)
}

classification_metrics = function(cutoff, model, model_type, x, y, m) {
  
  fit.pred = fit_pred(model, x, y, m)
 
  
  
  class<-factor(ifelse(fit.pred>cutoff,"Yes","No"),levels=c("No","Yes"))
  
  #Confusion Matrix for Lasso
  conf<-table(class,y)
  print(paste("Confusion matrix for ", model_type))
  print(conf)
  precision <- posPredValue(class, y, positive="Yes")
  recall <- sensitivity(class, y, positive="Yes")
  F1 <- (2 * precision * recall) / (precision + recall)
  print(paste("accuracy = ", round(mean(class==y) ,3), sep = ""))
  print(paste("precision = ", round(precision ,3), sep = ""))
  print(paste("recall = ", round(precision ,3), sep = ""))
  print(paste("F1 = ", round(F1 ,3), sep = ""))


}

roc_metrics = function(pred_results){
  
  roc = performance(pred_results, measure = "tpr", x.measure = "fpr")
  return(roc)
}

auc_metrics = function(pred_results) {
  auc <- performance(pred_results , measure = "auc")
  auc <- auc@y.values
  return(auc)
  
}
plot_roc = function (model_type, pred_results,x,y,c, ...) {
  roc = roc_metrics(pred_results)
  auc = auc_metrics(pred_results)
  plot(roc, colorize = c, ...)
  abline(a=0, b= 1)
  text(x = x, y = y, paste(model_type," AUC = ", round(auc[[1]],3), sep = ""))
}

Build a new model

Lets train an interpretable logistic regression using the lasso technique The point of this model is to be interpretable, meaning no exotic variables such as iteraction terms

str(train)
'data.frame':   400 obs. of  18 variables:
 $ sub_id    : Factor w/ 500 levels "1","2","3","4",..: 1 2 3 4 5 6 8 9 10 12 ...
 $ site_id   : Factor w/ 6 levels "1","2","3","4",..: 1 4 6 6 1 5 1 1 4 1 ...
 $ phy_id    : Factor w/ 127 levels "1","3","7","8",..: 5 89 110 113 23 104 22 4 87 20 ...
 $ priorfrac : Factor w/ 2 levels "No","Yes": 1 1 2 1 1 2 2 2 1 1 ...
 $ age       : int  62 65 88 82 61 67 82 86 58 56 ...
 $ weight    : num  70.3 87.1 50.8 62.1 68 ...
 $ height    : int  158 160 157 160 152 161 153 156 166 167 ...
 $ bmi       : num  28.2 34 20.6 24.3 29.4 ...
 $ premeno   : Factor w/ 2 levels "No","Yes": 1 1 1 1 1 1 1 1 1 1 ...
 $ momfrac   : Factor w/ 2 levels "No","Yes": 1 1 2 1 1 1 1 1 1 1 ...
 $ armassist : Factor w/ 2 levels "No","Yes": 1 1 2 1 1 1 1 1 1 2 ...
 $ smoke     : Factor w/ 2 levels "No","Yes": 1 1 1 1 1 2 1 1 1 2 ...
 $ raterisk  : Factor w/ 3 levels "Less","Same",..: 2 2 1 1 2 2 2 2 1 2 ...
 $ fracscore : int  1 2 11 5 1 4 7 7 0 3 ...
 $ fracture  : Factor w/ 2 levels "No","Yes": 1 1 1 1 1 1 1 1 1 1 ...
 $ bonemed   : Factor w/ 2 levels "No","Yes": 1 1 1 1 1 1 2 1 1 1 ...
 $ bonemed_fu: Factor w/ 2 levels "No","Yes": 1 1 1 1 1 1 2 1 1 1 ...
 $ bonetreat : Factor w/ 2 levels "No","Yes": 1 1 1 1 1 1 2 1 1 1 ...

train.x <- model.matrix(fracture~  priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu, train)

train.y<-train[,15]


nFolds = 10 
set.seed(4)
foldid  = sample(rep(seq(nFolds), length.out = nrow(train.x)))
lambdas_to_try <- 10^seq(-5, 5, length.out = 2000)
set.seed(5)               
cvfit = cv.glmnet(train.x, train.y, 
                   family = "binomial", 
                  alpha=1,
                   type.measure = "auc", 
                   lambda = lambdas_to_try, 
                   nfolds = nFolds, 
                   foldid = foldid,
                  parallel = T
                  )

plot(cvfit)


coef(cvfit, s = "lambda.min")
16 x 1 sparse Matrix of class "dgCMatrix"
                          1
(Intercept)      2.75972566
(Intercept)      .         
priorfracYes     0.20982197
age              .         
weight           .         
height          -0.03654858
bmi              0.02983405
premenoYes       0.33817019
momfracYes       0.54135015
armassistYes     .         
smokeYes        -0.51648719
rateriskSame     0.08395715
rateriskGreater  0.30842871
fracscore        0.17234464
bonemedYes       .         
bonemed_fuYes    0.61466291
print("CV AUC:")
[1] "CV AUC:"
cvfit$cvm[which(cvfit$lambda==cvfit$lambda.min)]
[1] 0.7160265
#Optimal penalty
print("Penalty Value:")
[1] "Penalty Value:"
cvfit$lambda.min
[1] 0.008345661

build a final interpretable model based on feature selection and lambda value selected above

#For final model predictions go ahead and refit lasso using entire
#data set
#finalmodel = glmnet(train.x, train.y, family = "binomial",lambda=cvfit$lambda.min)
finalmodel_lasso<-glmnet(train.x, train.y, 
                   family = "binomial", 
                  alpha=1,
                   lambda = cvfit$lambda.min ) 
summary(finalmodel_lasso)
           Length Class     Mode     
a0          1     -none-    numeric  
beta       15     dgCMatrix S4       
df          1     -none-    numeric  
dim         2     -none-    numeric  
lambda      1     -none-    numeric  
dev.ratio   1     -none-    numeric  
nulldev     1     -none-    numeric  
npasses     1     -none-    numeric  
jerr        1     -none-    numeric  
offset      1     -none-    logical  
classnames  2     -none-    character
call        6     -none-    call     
nobs        1     -none-    numeric  
coef(finalmodel_lasso)
16 x 1 sparse Matrix of class "dgCMatrix"
                         s0
(Intercept)      2.75904839
(Intercept)      .         
priorfracYes     0.20973560
age              .         
weight           .         
height          -0.03654457
bmi              0.02983270
premenoYes       0.33815169
momfracYes       0.54127143
armassistYes     .         
smokeYes        -0.51647430
rateriskSame     0.08411468
rateriskGreater  0.30853430
fracscore        0.17235143
bonemedYes       .         
bonemed_fuYes    0.61463897
finalmodel_lasso

Call:  glmnet(x = train.x, y = train.y, family = "binomial", alpha = 1,      lambda = cvfit$lambda.min) 

  Df %Dev   Lambda
1 10 11.6 0.008346
finalmodel<-glm(fracture ~  priorfrac + height + bmi + premeno + momfrac  +
                  smoke + raterisk + raterisk + fracscore  +
                  bonemed_fu 
                  , data=train,family = binomial(link="logit"))
coef(finalmodel)
    (Intercept)    priorfracYes          height             bmi      premenoYes      momfracYes        smokeYes    rateriskSame rateriskGreater 
     3.40776944      0.23453865     -0.04445750      0.04098255      0.49051506      0.66485670     -0.81240346      0.28440869      0.51029407 
      fracscore   bonemed_fuYes 
     0.19484141      0.68517384 
confint(finalmodel)
Waiting for profiling to be done...
                       2.5 %       97.5 %
(Intercept)     -3.354581776 10.335620486
priorfracYes    -0.370889267  0.830248373
height          -0.086352571 -0.004159104
bmi             -0.001765665  0.083791563
premenoYes      -0.131522644  1.097160098
momfracYes      -0.039143831  1.353228852
smokeYes        -2.123132353  0.258978045
rateriskSame    -0.341759864  0.923461916
rateriskGreater -0.155008633  1.187028169
fracscore        0.077177118  0.315554062
bonemed_fuYes    0.120048042  1.250983871
summary(finalmodel)

Call:
glm(formula = fracture ~ priorfrac + height + bmi + premeno + 
    momfrac + smoke + raterisk + raterisk + fracscore + bonemed_fu, 
    family = binomial(link = "logit"), data = train)

Deviance Residuals: 
     Min        1Q    Median        3Q       Max  
-1.76344  -0.75450  -0.53216   0.00826   2.27388  

Coefficients:
                Estimate Std. Error z value Pr(>|z|)   
(Intercept)      3.40777    3.48197   0.979  0.32773   
priorfracYes     0.23454    0.30566   0.767  0.44290   
height          -0.04446    0.02091  -2.126  0.03347 * 
bmi              0.04098    0.02174   1.885  0.05945 . 
premenoYes       0.49052    0.31216   1.571  0.11610   
momfracYes       0.66486    0.35364   1.880  0.06010 . 
smokeYes        -0.81240    0.59443  -1.367  0.17172   
rateriskSame     0.28441    0.32152   0.885  0.37639   
rateriskGreater  0.51029    0.34114   1.496  0.13469   
fracscore        0.19484    0.06064   3.213  0.00131 **
bonemed_fuYes    0.68517    0.28780   2.381  0.01728 * 
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 449.87  on 399  degrees of freedom
Residual deviance: 395.77  on 389  degrees of freedom
AIC: 417.77

Number of Fisher Scoring iterations: 4
train.x <- model.matrix(fracture~  priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu, train)

train.y<-train[,15]
preds_lasso = make_predictions(finalmodel_lasso, train.x, train.y, "lasso")
plot_roc("Lasso",preds_lasso,0.2,0.7,T)

classification_metrics(0.22, finalmodel_lasso, "Lasso", train.x, train.y, "lasso")
[1] "Confusion matrix for  Lasso"
     y
class  No Yes
  No  175  26
  Yes 125  74
[1] "accuracy = 0.623"
[1] "precision = 0.372"
[1] "recall = 0.372"
[1] "F1 = 0.495"

vif(finalmodel)
               GVIF Df GVIF^(1/(2*Df))
priorfrac  1.378453  1        1.174076
height     1.071086  1        1.034933
bmi        1.139912  1        1.067667
premeno    1.080826  1        1.039628
momfrac    1.078694  1        1.038602
smoke      1.037147  1        1.018404
raterisk   1.174003  2        1.040920
fracscore  1.437724  1        1.199051
bonemed_fu 1.232295  1        1.110088
plot(finalmodel)

lets look at predictions for the lasso model also looking at the roc plot to select the most optimal threhold for classification

hoslem.test(finalmodel$y, fitted(finalmodel), g=10)

    Hosmer and Lemeshow goodness of fit (GOF) test

data:  finalmodel$y, fitted(finalmodel)
X-squared = 3.2685, df = 8, p-value = 0.9164

There is a large p-value so the test is a fit

test.x <- model.matrix(fracture~  priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu, test)

test.y<-test[,15]
preds_lasso = make_predictions(finalmodel_lasso, test.x, test.y, "lasso")
plot_roc("Lasso",preds_lasso,0.2,0.7,T)

classification_metrics(0.3, finalmodel_lasso, "Lasso", test.x, test.y, "lasso")
[1] "Confusion matrix for  Lasso"
     y
class No Yes
  No  55  15
  Yes 20  10
[1] "accuracy = 0.65"
[1] "precision = 0.333"
[1] "recall = 0.333"
[1] "F1 = 0.364"

lets look at model performance metrics

Stepwise regression

library(leaps)
nvmax = 14
reg_sq=regsubsets(fracture~.-sub_id-site_id-phy_id-bonetreat,data=train, method="seqrep", nvmax=nvmax)
par(mfrow=c(2,2))
cp<-summary(reg_sq)$cp
plot(1:(nvmax),cp,type="l",ylab="CP",xlab="# of predictors")
index<-which(cp==min(cp))
points(index,cp[index],col="red",pch=10)
bics<-summary(reg_sq)$bic
plot(1:(nvmax),bics,type="l",ylab="BIC",xlab="# of predictors")
index<-which(bics==-0.05839447)
points(index,bics[index],col="red",pch=10)
adjr2<-summary(reg_sq)$adjr2
plot(1:(nvmax),adjr2,type="l",ylab="Adjusted R-squared",xlab="# of predictors")
index<-which(adjr2==max(adjr2))
points(index,adjr2[index],col="red",pch=10)
rss<-summary(reg_sq)$rss
plot(1:(nvmax),rss,type="l",ylab="train RSS",xlab="# of predictors")
index<-which(rss==min(rss))
points(index,rss[index],col="red",pch=10)


cbind(CP=summary(reg_sq)$cp,
      r2=summary(reg_sq)$rsq,
      Adj_r2=summary(reg_sq)$adjr2,
      BIC=summary(reg_sq)$bic,
      RSS = summary(reg_sq)$rss)
             CP         r2     Adj_r2        BIC      RSS
 [1,] 21.250487 0.06228673 0.05993067 -13.741495 70.32850
 [2,] 12.832558 0.08569960 0.08109355 -17.864044 68.57253
 [3,] 10.601089 0.09520924 0.08835477 -16.054770 67.85931
 [4,]  8.301930 0.10487101 0.09580642 -14.357658 67.13467
 [5,]  5.502043 0.11565810 0.10443549 -13.215824 66.32564
 [6,]  5.136300 0.12097478 0.10755455  -9.636426 65.92689
 [7,]  5.395537 0.12488691 0.10925989  -5.429147 65.63348
 [8,]  5.468230 0.12921827 0.11140176  -1.422391 65.30863
 [9,] 16.696131 0.10847983 0.08790628  13.983760 66.86401
[10,]  7.734269 0.13311511 0.11083015   8.766479 65.01637
[11,]  9.334520 0.13401349 0.10946233  14.343195 64.94899
[12,] 11.028543 0.13470113 0.10787016  20.016911 64.89742
[13,] 13.010891 0.13474080 0.10559995  25.990037 64.89444
[14,] 15.000000 0.13476528 0.10330220  31.970187 64.89260
coef(reg_sq, 8)
    (Intercept)          weight             bmi      premenoYes      momfracYes        smokeYes rateriskGreater       fracscore   bonemed_fuYes 
    0.843129090    -0.008740739     0.029712437     0.075965266     0.121425302    -0.115804861     0.068753886     0.036854265     0.132305160 
summary.out <- summary(reg_sq)
which.max(summary.out$adjr2)
[1] 8
summary.out$which[8,]
    (Intercept)    priorfracYes             age          weight          height             bmi      premenoYes      momfracYes    armassistYes 
           TRUE           FALSE           FALSE            TRUE           FALSE            TRUE            TRUE            TRUE           FALSE 
       smokeYes    rateriskSame rateriskGreater       fracscore      bonemedYes   bonemed_fuYes 
           TRUE           FALSE            TRUE            TRUE           FALSE            TRUE 
#To deal with the redundamcy, I would throw the cylinder variable out and then see what happens
model.main<-glm(fracture ~raterisk+weight+bmi+premeno+momfrac+fracscore+bonemed_fu+smoke, data=train,family = binomial(link="logit"))
summary(model.main)

Call:
glm(formula = fracture ~ raterisk + weight + bmi + premeno + 
    momfrac + fracscore + bonemed_fu + smoke, family = binomial(link = "logit"), 
    data = train)

Deviance Residuals: 
     Min        1Q    Median        3Q       Max  
-1.75847  -0.74349  -0.53853  -0.03179   2.29136  

Coefficients:
                Estimate Std. Error z value Pr(>|z|)    
(Intercept)     -3.78703    0.74016  -5.117 3.11e-07 ***
rateriskSame     0.29070    0.32185   0.903  0.36641    
rateriskGreater  0.56026    0.33585   1.668  0.09528 .  
weight          -0.05048    0.02278  -2.216  0.02671 *  
bmi              0.17195    0.06177   2.784  0.00537 ** 
premenoYes       0.47993    0.31256   1.535  0.12466    
momfracYes       0.62776    0.35007   1.793  0.07294 .  
fracscore        0.21909    0.05289   4.142 3.44e-05 ***
bonemed_fuYes    0.69337    0.28701   2.416  0.01570 *  
smokeYes        -0.80144    0.59573  -1.345  0.17853    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 449.87  on 399  degrees of freedom
Residual deviance: 395.89  on 390  degrees of freedom
AIC: 415.89

Number of Fisher Scoring iterations: 4
exp(cbind("Odds ratio" = coef(model.main), confint.default(model.main, level = 0.95)))
                Odds ratio       2.5 %     97.5 %
(Intercept)     0.02266271 0.005312358 0.09667991
rateriskSame    1.33736473 0.711685586 2.51311038
rateriskGreater 1.75112184 0.906650867 3.38214830
weight          0.95077157 0.909250707 0.99418848
bmi             1.18761885 1.052203055 1.34046230
premenoYes      1.61596380 0.875750592 2.98182957
momfracYes      1.87340483 0.943300490 3.72060195
fracscore       1.24494529 1.122346773 1.38093575
bonemed_fuYes   2.00044972 1.139784673 3.51101325
smokeYes        0.44868282 0.139588358 1.44221395
vif(model.main)
               GVIF Df GVIF^(1/(2*Df))
raterisk   1.136099  2        1.032414
weight     9.291085  1        3.048128
bmi        9.173003  1        3.028697
premeno    1.081246  1        1.039830
momfrac    1.061681  1        1.030379
fracscore  1.091831  1        1.044907
bonemed_fu 1.226947  1        1.107677
smoke      1.037015  1        1.018339
#Residual diagnostics can be obtained using
plot(model.main)

train_select = subset(train, select = c(weight,bmi,premeno,momfrac,fracscore,bonemed_fu,smoke,raterisk,fracture))
preds_step = make_predictions(model.main, train_select,train_select$fracture, "stepwise")
plot_roc("Step",preds_step,0.2,0.8,T)

classification_metrics(0.22, model.main, "Step", train_select,train_select$fracture, "stepwise")
[1] "Confusion matrix for  Step"
     y
class  No Yes
  No  184  27
  Yes 116  73
[1] "accuracy = 0.642"
[1] "precision = 0.386"
[1] "recall = 0.386"
[1] "F1 = 0.505"
test_select = subset(test, select = c(weight,bmi,premeno,momfrac,fracscore,bonemed_fu,smoke,raterisk,fracture))
preds_step = make_predictions(model.main, test_select,test_select$fracture, "stepwise")
plot_roc("Step",preds_step,0.2,0.8,T)

classification_metrics(0.22, model.main, "Step", test_select,test_select$fracture, "stepwise")
[1] "Confusion matrix for  Step"
     y
class No Yes
  No  47   9
  Yes 28  16
[1] "accuracy = 0.63"
[1] "precision = 0.364"
[1] "recall = 0.364"
[1] "F1 = 0.464"

lets look at model performance metrics


plot_roc("Step",preds_step,0.2,0.8,F, col="red")
par(new=T)
plot_roc("Lasso",preds_lasso,0.2,0.7,F, col="blue")
legend(0.7, 0.3,legend = c("Step","Lasso"), fill=c("red","blue"))

Objective 2

# Feature Eng

#Square numerical variables 
train$ageSquared = train$age**2
train$weightSquared = train$weight**2
train$heigthSquared = train$height**2
train$bmiSquared = train$bmi**2

#Cubic numerical variables
train$ageCubic = train$age**3
train$weightCubic = train$weight**3
train$heigthCubic = train$height**3
train$bmiCubic= train$bmi**3


#Square numerical variables 
test$ageSquared = test$age**2
test$weightSquared = test$weight**2
test$heigthSquared = test$height**2
test$bmiSquared = test$bmi**2

#Cubic numerical variables
test$ageCubic = test$age**3
test$weightCubic = test$weight**3
test$heigthCubic = test$height**3
test$bmiCubic= test$bmi**3


# drop cols
train = subset(train, select = -c(sub_id,site_id,phy_id))
test = subset(test, select = -c(sub_id,site_id,phy_id))


head(train)
# Scale numeric variables

preProcValues = preProcess(train, method = c("scale"))
train_transformed <- predict(preProcValues, train)
test_transformed <- predict(preProcValues, test)
test_transformed
NA
NA
NA

train.x <- model.matrix(fracture~ .*. , train_transformed)

train.y<-train_transformed[,12]


nFolds = 10 
set.seed(3)
foldid  = sample(rep(seq(nFolds), length.out = nrow(train.x)))
lambdas_to_try <- 10^seq(-3, 5, length.out = 2000)
set.seed(3)               
cvfit = cv.glmnet(train.x, train.y, 
                   family = "binomial", 
                   type.measure = "class", 
                   lambda = lambdas_to_try, 
                   nfolds = nFolds, 
                   foldid = foldid)

plot(cvfit)


coef(cvfit, s = "lambda.min")
277 x 1 sparse Matrix of class "dgCMatrix"
                                          1
(Intercept)                    2.959400e+00
(Intercept)                    .           
priorfracYes                   .           
age                            .           
weight                         .           
height                        -2.129608e-01
bmi                            .           
premenoYes                     .           
momfracYes                     .           
armassistYes                   1.954138e-01
smokeYes                       .           
rateriskSame                   .           
rateriskGreater                .           
fracscore                      3.059031e-01
bonemedYes                     .           
bonemed_fuYes                  .           
bonetreatYes                   .           
ageSquared                     .           
weightSquared                  .           
heigthSquared                  .           
bmiSquared                     .           
ageCubic                       .           
weightCubic                    .           
heigthCubic                    .           
bmiCubic                       .           
priorfracYes:age               .           
priorfracYes:weight            .           
priorfracYes:height            .           
priorfracYes:bmi               .           
priorfracYes:premenoYes       -1.179081e+00
priorfracYes:momfracYes       -1.101638e+00
priorfracYes:armassistYes      .           
priorfracYes:smokeYes          .           
priorfracYes:rateriskSame      8.201626e-01
priorfracYes:rateriskGreater   1.109672e+00
priorfracYes:fracscore         .           
priorfracYes:bonemedYes        .           
priorfracYes:bonemed_fuYes     .           
priorfracYes:bonetreatYes     -1.715055e+00
priorfracYes:ageSquared        .           
priorfracYes:weightSquared     .           
priorfracYes:heigthSquared     .           
priorfracYes:bmiSquared        1.359998e-01
priorfracYes:ageCubic          .           
priorfracYes:weightCubic       .           
priorfracYes:heigthCubic       .           
priorfracYes:bmiCubic          .           
age:weight                     .           
age:height                     .           
age:bmi                        .           
age:premenoYes                 4.571901e-02
age:momfracYes                 .           
age:armassistYes               .           
age:smokeYes                   .           
age:rateriskSame               .           
age:rateriskGreater            .           
age:fracscore                  .           
age:bonemedYes                 .           
age:bonemed_fuYes              .           
age:bonetreatYes               .           
age:ageSquared                 .           
age:weightSquared              .           
age:heigthSquared              .           
age:bmiSquared                 .           
age:ageCubic                   .           
age:weightCubic                .           
age:heigthCubic                .           
age:bmiCubic                   .           
weight:height                  .           
weight:bmi                     .           
weight:premenoYes              .           
weight:momfracYes              .           
weight:armassistYes            .           
weight:smokeYes                .           
weight:rateriskSame            .           
weight:rateriskGreater         .           
weight:fracscore               .           
weight:bonemedYes              .           
weight:bonemed_fuYes           .           
weight:bonetreatYes            .           
weight:ageSquared              .           
weight:weightSquared           .           
weight:heigthSquared           .           
weight:bmiSquared              .           
weight:ageCubic                .           
weight:weightCubic             .           
weight:heigthCubic             .           
weight:bmiCubic                .           
height:bmi                     .           
height:premenoYes              .           
height:momfracYes              .           
height:armassistYes            .           
height:smokeYes                .           
height:rateriskSame            .           
height:rateriskGreater         .           
height:fracscore               .           
height:bonemedYes              .           
height:bonemed_fuYes           .           
height:bonetreatYes            .           
height:ageSquared              .           
height:weightSquared           .           
height:heigthSquared           .           
height:bmiSquared              .           
height:ageCubic                .           
height:weightCubic             .           
height:heigthCubic             .           
height:bmiCubic                .           
bmi:premenoYes                 .           
bmi:momfracYes                 .           
bmi:armassistYes               1.999989e-02
bmi:smokeYes                  -4.256769e-02
bmi:rateriskSame               .           
bmi:rateriskGreater            .           
bmi:fracscore                  4.773642e-03
bmi:bonemedYes                 .           
bmi:bonemed_fuYes              .           
bmi:bonetreatYes               .           
bmi:ageSquared                 .           
bmi:weightSquared              .           
bmi:heigthSquared              .           
bmi:bmiSquared                 .           
bmi:ageCubic                   .           
bmi:weightCubic                .           
bmi:heigthCubic                .           
bmi:bmiCubic                   .           
premenoYes:momfracYes          .           
premenoYes:armassistYes        4.980359e-01
premenoYes:smokeYes           -1.627461e+00
premenoYes:rateriskSame        1.143115e-01
premenoYes:rateriskGreater     3.001823e-01
premenoYes:fracscore           .           
premenoYes:bonemedYes          .           
premenoYes:bonemed_fuYes      -1.438804e-01
premenoYes:bonetreatYes        .           
premenoYes:ageSquared          1.153313e-01
premenoYes:weightSquared       .           
premenoYes:heigthSquared       .           
premenoYes:bmiSquared          .           
premenoYes:ageCubic            .           
premenoYes:weightCubic        -2.270677e-01
premenoYes:heigthCubic         .           
premenoYes:bmiCubic            .           
momfracYes:armassistYes       -1.195593e+00
momfracYes:smokeYes           -2.138175e-02
momfracYes:rateriskSame        1.318237e+00
momfracYes:rateriskGreater     2.725283e-01
momfracYes:fracscore           .           
momfracYes:bonemedYes         -2.112374e+00
momfracYes:bonemed_fuYes       .           
momfracYes:bonetreatYes       -2.235617e-14
momfracYes:ageSquared          .           
momfracYes:weightSquared       .           
momfracYes:heigthSquared       .           
momfracYes:bmiSquared          .           
momfracYes:ageCubic            3.814712e-01
momfracYes:weightCubic         .           
momfracYes:heigthCubic         4.230337e-02
momfracYes:bmiCubic            .           
armassistYes:smokeYes          .           
armassistYes:rateriskSame      4.433623e-01
armassistYes:rateriskGreater  -2.161403e-01
armassistYes:fracscore         .           
armassistYes:bonemedYes        .           
armassistYes:bonemed_fuYes     .           
armassistYes:bonetreatYes     -1.110935e+00
armassistYes:ageSquared        .           
armassistYes:weightSquared     .           
armassistYes:heigthSquared     .           
armassistYes:bmiSquared        .           
armassistYes:ageCubic          .           
armassistYes:weightCubic       .           
armassistYes:heigthCubic       .           
armassistYes:bmiCubic          .           
smokeYes:rateriskSame          .           
smokeYes:rateriskGreater       .           
smokeYes:fracscore             .           
smokeYes:bonemedYes            5.672542e+00
smokeYes:bonemed_fuYes         3.679955e-14
smokeYes:bonetreatYes          1.066654e-15
smokeYes:ageSquared            .           
smokeYes:weightSquared         .           
smokeYes:heigthSquared         .           
smokeYes:bmiSquared           -2.009142e-01
smokeYes:ageCubic             -2.717168e-01
smokeYes:weightCubic           .           
smokeYes:heigthCubic           .           
smokeYes:bmiCubic              .           
rateriskSame:fracscore         .           
rateriskGreater:fracscore      .           
rateriskSame:bonemedYes        .           
rateriskGreater:bonemedYes     .           
rateriskSame:bonemed_fuYes     7.436998e-01
rateriskGreater:bonemed_fuYes  .           
rateriskSame:bonetreatYes      .           
rateriskGreater:bonetreatYes   3.094663e-01
rateriskSame:ageSquared        .           
rateriskGreater:ageSquared     .           
rateriskSame:weightSquared     .           
rateriskGreater:weightSquared  1.356196e-02
rateriskSame:heigthSquared     .           
rateriskGreater:heigthSquared  .           
rateriskSame:bmiSquared        .           
rateriskGreater:bmiSquared     .           
rateriskSame:ageCubic         -4.552324e-02
rateriskGreater:ageCubic       .           
rateriskSame:weightCubic      -3.051524e-01
rateriskGreater:weightCubic    .           
rateriskSame:heigthCubic       .           
rateriskGreater:heigthCubic    1.677445e-02
rateriskSame:bmiCubic          .           
rateriskGreater:bmiCubic       .           
fracscore:bonemedYes           3.616891e-01
fracscore:bonemed_fuYes        .           
fracscore:bonetreatYes         .           
fracscore:ageSquared           .           
fracscore:weightSquared        .           
fracscore:heigthSquared        .           
fracscore:bmiSquared           .           
fracscore:ageCubic             .           
fracscore:weightCubic          .           
fracscore:heigthCubic          7.546837e-05
fracscore:bmiCubic             .           
bonemedYes:bonemed_fuYes       .           
bonemedYes:bonetreatYes        .           
bonemedYes:ageSquared          .           
bonemedYes:weightSquared       .           
bonemedYes:heigthSquared       .           
bonemedYes:bmiSquared          .           
bonemedYes:ageCubic            .           
bonemedYes:weightCubic         .           
bonemedYes:heigthCubic         .           
bonemedYes:bmiCubic            4.526232e-01
bonemed_fuYes:bonetreatYes     .           
bonemed_fuYes:ageSquared       .           
bonemed_fuYes:weightSquared    .           
bonemed_fuYes:heigthSquared    .           
bonemed_fuYes:bmiSquared       .           
bonemed_fuYes:ageCubic         .           
bonemed_fuYes:weightCubic     -1.189027e+00
bonemed_fuYes:heigthCubic      .           
bonemed_fuYes:bmiCubic         1.950171e+00
bonetreatYes:ageSquared        .           
bonetreatYes:weightSquared     .           
bonetreatYes:heigthSquared     .           
bonetreatYes:bmiSquared        .           
bonetreatYes:ageCubic          .           
bonetreatYes:weightCubic       .           
bonetreatYes:heigthCubic      -1.047053e-01
bonetreatYes:bmiCubic          .           
ageSquared:weightSquared       .           
ageSquared:heigthSquared       .           
ageSquared:bmiSquared          .           
ageSquared:ageCubic            .           
ageSquared:weightCubic         .           
ageSquared:heigthCubic         .           
ageSquared:bmiCubic            .           
weightSquared:heigthSquared    .           
weightSquared:bmiSquared       .           
weightSquared:ageCubic         .           
weightSquared:weightCubic     -7.799537e-04
weightSquared:heigthCubic      .           
weightSquared:bmiCubic         .           
heigthSquared:bmiSquared       .           
heigthSquared:ageCubic         .           
heigthSquared:weightCubic      .           
heigthSquared:heigthCubic      .           
heigthSquared:bmiCubic         .           
bmiSquared:ageCubic            .           
bmiSquared:weightCubic         .           
bmiSquared:heigthCubic         .           
bmiSquared:bmiCubic            .           
ageCubic:weightCubic           .           
ageCubic:heigthCubic           .           
ageCubic:bmiCubic              .           
weightCubic:heigthCubic        .           
weightCubic:bmiCubic           .           
heigthCubic:bmiCubic           .           
print("CV Error Rate:")
[1] "CV Error Rate:"
cvfit$cvm[which(cvfit$lambda==cvfit$lambda.min)]
[1] 0.2275
#Optimal penalty
print("Penalty Value:")
[1] "Penalty Value:"
cvfit$lambda.min
[1] 0.00520425
finalmode_ob2 = glmnet(train.x, train.y, 
                   family = "binomial", 
                  alpha=1,
                   lambda = cvfit$lambda.min ) 
summary(finalmode_ob2)
           Length Class     Mode     
a0           1    -none-    numeric  
beta       276    dgCMatrix S4       
df           1    -none-    numeric  
dim          2    -none-    numeric  
lambda       1    -none-    numeric  
dev.ratio    1    -none-    numeric  
nulldev      1    -none-    numeric  
npasses      1    -none-    numeric  
jerr         1    -none-    numeric  
offset       1    -none-    logical  
classnames   2    -none-    character
call         6    -none-    call     
nobs         1    -none-    numeric  
coef(finalmode_ob2)
277 x 1 sparse Matrix of class "dgCMatrix"
                                         s0
(Intercept)                    2.914960e+00
(Intercept)                    .           
priorfracYes                   .           
age                            .           
weight                         .           
height                        -2.112334e-01
bmi                            .           
premenoYes                     .           
momfracYes                     .           
armassistYes                   2.260572e-01
smokeYes                       .           
rateriskSame                   .           
rateriskGreater                .           
fracscore                      2.997467e-01
bonemedYes                     .           
bonemed_fuYes                  .           
bonetreatYes                   .           
ageSquared                     .           
weightSquared                  .           
heigthSquared                  .           
bmiSquared                     .           
ageCubic                       .           
weightCubic                    .           
heigthCubic                    .           
bmiCubic                       .           
priorfracYes:age               .           
priorfracYes:weight            .           
priorfracYes:height            .           
priorfracYes:bmi               .           
priorfracYes:premenoYes       -1.173120e+00
priorfracYes:momfracYes       -1.101617e+00
priorfracYes:armassistYes      .           
priorfracYes:smokeYes          .           
priorfracYes:rateriskSame      8.233277e-01
priorfracYes:rateriskGreater   1.113189e+00
priorfracYes:fracscore         .           
priorfracYes:bonemedYes        .           
priorfracYes:bonemed_fuYes     .           
priorfracYes:bonetreatYes     -1.713966e+00
priorfracYes:ageSquared        .           
priorfracYes:weightSquared     .           
priorfracYes:heigthSquared     .           
priorfracYes:bmiSquared        1.344424e-01
priorfracYes:ageCubic          .           
priorfracYes:weightCubic       .           
priorfracYes:heigthCubic       .           
priorfracYes:bmiCubic          .           
age:weight                     .           
age:height                     .           
age:bmi                        .           
age:premenoYes                 3.816808e-02
age:momfracYes                 .           
age:armassistYes               .           
age:smokeYes                   .           
age:rateriskSame               .           
age:rateriskGreater            .           
age:fracscore                  .           
age:bonemedYes                 .           
age:bonemed_fuYes              .           
age:bonetreatYes               .           
age:ageSquared                 .           
age:weightSquared              .           
age:heigthSquared              .           
age:bmiSquared                 .           
age:ageCubic                   .           
age:weightCubic                .           
age:heigthCubic                .           
age:bmiCubic                   .           
weight:height                  .           
weight:bmi                     .           
weight:premenoYes              .           
weight:momfracYes              .           
weight:armassistYes            .           
weight:smokeYes                .           
weight:rateriskSame            .           
weight:rateriskGreater         .           
weight:fracscore               .           
weight:bonemedYes              .           
weight:bonemed_fuYes           .           
weight:bonetreatYes            .           
weight:ageSquared              .           
weight:weightSquared           .           
weight:heigthSquared           .           
weight:bmiSquared              .           
weight:ageCubic                .           
weight:weightCubic             .           
weight:heigthCubic             .           
weight:bmiCubic                .           
height:bmi                     .           
height:premenoYes              .           
height:momfracYes              .           
height:armassistYes            .           
height:smokeYes                .           
height:rateriskSame            .           
height:rateriskGreater         .           
height:fracscore               .           
height:bonemedYes              .           
height:bonemed_fuYes           .           
height:bonetreatYes            .           
height:ageSquared              .           
height:weightSquared           .           
height:heigthSquared           .           
height:bmiSquared              .           
height:ageCubic                .           
height:weightCubic             .           
height:heigthCubic             .           
height:bmiCubic                .           
bmi:premenoYes                 .           
bmi:momfracYes                 .           
bmi:armassistYes               1.393926e-02
bmi:smokeYes                  -3.047955e-02
bmi:rateriskSame               .           
bmi:rateriskGreater            .           
bmi:fracscore                  6.297772e-03
bmi:bonemedYes                 .           
bmi:bonemed_fuYes              .           
bmi:bonetreatYes               .           
bmi:ageSquared                 .           
bmi:weightSquared              .           
bmi:heigthSquared              .           
bmi:bmiSquared                 .           
bmi:ageCubic                   .           
bmi:weightCubic                .           
bmi:heigthCubic                .           
bmi:bmiCubic                   .           
premenoYes:momfracYes          .           
premenoYes:armassistYes        4.948762e-01
premenoYes:smokeYes           -1.628943e+00
premenoYes:rateriskSame        1.180272e-01
premenoYes:rateriskGreater     3.030984e-01
premenoYes:fracscore           .           
premenoYes:bonemedYes          .           
premenoYes:bonemed_fuYes      -1.427633e-01
premenoYes:bonetreatYes        .           
premenoYes:ageSquared          1.290376e-01
premenoYes:weightSquared       .           
premenoYes:heigthSquared       .           
premenoYes:bmiSquared          .           
premenoYes:ageCubic            .           
premenoYes:weightCubic        -2.239824e-01
premenoYes:heigthCubic         .           
premenoYes:bmiCubic            .           
momfracYes:armassistYes       -1.195943e+00
momfracYes:smokeYes           -3.217459e-02
momfracYes:rateriskSame        1.318280e+00
momfracYes:rateriskGreater     2.739763e-01
momfracYes:fracscore           .           
momfracYes:bonemedYes         -2.111143e+00
momfracYes:bonemed_fuYes       .           
momfracYes:bonetreatYes       -5.212441e-16
momfracYes:ageSquared          .           
momfracYes:weightSquared       .           
momfracYes:heigthSquared       .           
momfracYes:bmiSquared          .           
momfracYes:ageCubic            3.811591e-01
momfracYes:weightCubic         .           
momfracYes:heigthCubic         4.236837e-02
momfracYes:bmiCubic            .           
armassistYes:smokeYes          .           
armassistYes:rateriskSame      4.411151e-01
armassistYes:rateriskGreater  -2.196226e-01
armassistYes:fracscore         .           
armassistYes:bonemedYes        .           
armassistYes:bonemed_fuYes     .           
armassistYes:bonetreatYes     -1.112681e+00
armassistYes:ageSquared        .           
armassistYes:weightSquared     .           
armassistYes:heigthSquared     .           
armassistYes:bmiSquared        .           
armassistYes:ageCubic          .           
armassistYes:weightCubic       .           
armassistYes:heigthCubic       .           
armassistYes:bmiCubic          .           
smokeYes:rateriskSame          .           
smokeYes:rateriskGreater       .           
smokeYes:fracscore             .           
smokeYes:bonemedYes            5.688345e+00
smokeYes:bonemed_fuYes         8.721593e-15
smokeYes:bonetreatYes          1.779917e-16
smokeYes:ageSquared            .           
smokeYes:weightSquared         .           
smokeYes:heigthSquared         .           
smokeYes:bmiSquared           -2.178922e-01
smokeYes:ageCubic             -2.789669e-01
smokeYes:weightCubic           .           
smokeYes:heigthCubic           .           
smokeYes:bmiCubic              .           
rateriskSame:fracscore         .           
rateriskGreater:fracscore      .           
rateriskSame:bonemedYes        .           
rateriskGreater:bonemedYes     .           
rateriskSame:bonemed_fuYes     7.404030e-01
rateriskGreater:bonemed_fuYes  .           
rateriskSame:bonetreatYes      .           
rateriskGreater:bonetreatYes   3.075943e-01
rateriskSame:ageSquared        .           
rateriskGreater:ageSquared     .           
rateriskSame:weightSquared     .           
rateriskGreater:weightSquared  1.399931e-02
rateriskSame:heigthSquared     .           
rateriskGreater:heigthSquared  .           
rateriskSame:bmiSquared        .           
rateriskGreater:bmiSquared     .           
rateriskSame:ageCubic         -4.525273e-02
rateriskGreater:ageCubic       .           
rateriskSame:weightCubic      -3.052743e-01
rateriskGreater:weightCubic    .           
rateriskSame:heigthCubic       .           
rateriskGreater:heigthCubic    1.661660e-02
rateriskSame:bmiCubic          .           
rateriskGreater:bmiCubic       .           
fracscore:bonemedYes           3.605574e-01
fracscore:bonemed_fuYes        .           
fracscore:bonetreatYes         .           
fracscore:ageSquared           .           
fracscore:weightSquared        .           
fracscore:heigthSquared        .           
fracscore:bmiSquared           .           
fracscore:ageCubic             .           
fracscore:weightCubic          .           
fracscore:heigthCubic          2.845694e-06
fracscore:bmiCubic             .           
bonemedYes:bonemed_fuYes       .           
bonemedYes:bonetreatYes        .           
bonemedYes:ageSquared          .           
bonemedYes:weightSquared       .           
bonemedYes:heigthSquared       .           
bonemedYes:bmiSquared          .           
bonemedYes:ageCubic            .           
bonemedYes:weightCubic         .           
bonemedYes:heigthCubic         .           
bonemedYes:bmiCubic            4.503189e-01
bonemed_fuYes:bonetreatYes     .           
bonemed_fuYes:ageSquared       .           
bonemed_fuYes:weightSquared    .           
bonemed_fuYes:heigthSquared    .           
bonemed_fuYes:bmiSquared       .           
bonemed_fuYes:ageCubic         .           
bonemed_fuYes:weightCubic     -1.217340e+00
bonemed_fuYes:heigthCubic      .           
bonemed_fuYes:bmiCubic         1.976471e+00
bonetreatYes:ageSquared        .           
bonetreatYes:weightSquared     .           
bonetreatYes:heigthSquared     .           
bonetreatYes:bmiSquared        .           
bonetreatYes:ageCubic          .           
bonetreatYes:weightCubic       .           
bonetreatYes:heigthCubic      -1.038970e-01
bonetreatYes:bmiCubic          .           
ageSquared:weightSquared       .           
ageSquared:heigthSquared       .           
ageSquared:bmiSquared          .           
ageSquared:ageCubic            .           
ageSquared:weightCubic         .           
ageSquared:heigthCubic         .           
ageSquared:bmiCubic            .           
weightSquared:heigthSquared    .           
weightSquared:bmiSquared       .           
weightSquared:ageCubic         .           
weightSquared:weightCubic     -3.981357e-04
weightSquared:heigthCubic      .           
weightSquared:bmiCubic         .           
heigthSquared:bmiSquared       .           
heigthSquared:ageCubic         .           
heigthSquared:weightCubic      .           
heigthSquared:heigthCubic      .           
heigthSquared:bmiCubic         .           
bmiSquared:ageCubic            .           
bmiSquared:weightCubic         .           
bmiSquared:heigthCubic         .           
bmiSquared:bmiCubic            .           
ageCubic:weightCubic           .           
ageCubic:heigthCubic           .           
ageCubic:bmiCubic              .           
weightCubic:heigthCubic        .           
weightCubic:bmiCubic           .           
heigthCubic:bmiCubic           .           
finalmodel_lasso

Call:  glmnet(x = train.x, y = train.y, family = "binomial", alpha = 1,      lambda = cvfit$lambda.min) 

  Df %Dev   Lambda
1 10 11.6 0.008346
#coef(finalmode_ob2)
#confint(finalmode_ob2)
summary(finalmode_ob2)
           Length Class     Mode     
a0           1    -none-    numeric  
beta       276    dgCMatrix S4       
df           1    -none-    numeric  
dim          2    -none-    numeric  
lambda       1    -none-    numeric  
dev.ratio    1    -none-    numeric  
nulldev      1    -none-    numeric  
npasses      1    -none-    numeric  
jerr         1    -none-    numeric  
offset       1    -none-    logical  
classnames   2    -none-    character
call         6    -none-    call     
nobs         1    -none-    numeric  
finalmode_ob2

Call:  glmnet(x = train.x, y = train.y, family = "binomial", alpha = 1,      lambda = cvfit$lambda.min) 

  Df  %Dev   Lambda
1 49 29.07 0.005204
preds_ob2_lr = make_predictions(finalmode_ob2, train.x, train.y,"lasso")
plot_roc("Complex Lasso",preds_ob2_lr,0.2,0.8,T)

classification_metrics(0.30, finalmode_ob2, "Complex LR", train.x, train.y,"lasso")
[1] "Confusion matrix for  Complex LR"
     y
class  No Yes
  No  251  32
  Yes  49  68
[1] "accuracy = 0.797"
[1] "precision = 0.581"
[1] "recall = 0.581"
[1] "F1 = 0.627"
test.x <- model.matrix(fracture~ .*. , test_transformed)

test.y<-test_transformed[,12]
preds_ob2_lr = make_predictions(finalmode_ob2, test.x, test.y,"lasso")
plot_roc("Complex Lasso",preds_ob2_lr,0.2,0.8,T)

classification_metrics(0.20, finalmode_ob2, "Complex LR", test.x, test.y,"lasso")
[1] "Confusion matrix for  Complex LR"
     y
class No Yes
  No  53  10
  Yes 22  15
[1] "accuracy = 0.68"
[1] "precision = 0.405"
[1] "recall = 0.405"
[1] "F1 = 0.484"
train
train_x = subset(train, select=-c(fracture))
train_x

Build random forest model

fitControl <- trainControl(
    method = 'repeatedcv',                  
    number = 10,
    repeats = 10,
    savePredictions = 'final',
    verboseIter = FALSE,
    classProbs = TRUE,
    search='grid'
) 

tunegrid <- expand.grid(.mtry = (1:15)) 

rpart_fit = train(fracture ~ ., data=train, method="rf", trControl = fitControl, tuneGrid = tunegrid)
print(rpart_fit)
Random Forest 

400 samples
 22 predictor
  2 classes: 'No', 'Yes' 

No pre-processing
Resampling: Cross-Validated (10 fold, repeated 10 times) 
Summary of sample sizes: 360, 360, 360, 360, 360, 360, ... 
Resampling results across tuning parameters:

  mtry  Accuracy  Kappa     
   1    0.75150   0.02145022
   2    0.76450   0.16515999
   3    0.76900   0.20634366
   4    0.77125   0.22632281
   5    0.77025   0.23283625
   6    0.77500   0.25137020
   7    0.77225   0.24778541
   8    0.77525   0.25764832
   9    0.77400   0.25685688
  10    0.77450   0.26229126
  11    0.77075   0.24923312
  12    0.77050   0.24824716
  13    0.77200   0.26409136
  14    0.77200   0.26209103
  15    0.76850   0.25053520

Accuracy was used to select the optimal model using the largest value.
The final value used for the model was mtry = 8.


preds_rf = make_predictions(rpart_fit, train,train$fracture, "rf")
plot_roc("RF",preds_rf,0.2,0.8,T)

classification_metrics(0.5, rpart_fit, "Step", train,train$fracture, "rf")
[1] "Confusion matrix for  Step"
     y
class  No Yes
  No  300   0
  Yes   0 100
[1] "accuracy = 1"
[1] "precision = 1"
[1] "recall = 1"
[1] "F1 = 1"


preds_rf = make_predictions(rpart_fit, test,test$fracture, "rf")
plot_roc("RF",preds_rf,0.2,0.8,T)

classification_metrics(0.22, rpart_fit, "RF", test,test$fracture, "rf")
[1] "Confusion matrix for  RF"
     y
class No Yes
  No  39   9
  Yes 36  16
[1] "accuracy = 0.55"
[1] "precision = 0.308"
[1] "recall = 0.308"
[1] "F1 = 0.416"
#library(MASS)
#library(pheatmap)
#fit.lda <- lda(fracture ~ ., data = train_transformed,  CV = TRUE)
#fit.lda


fitControl <- trainControl(
    method = 'repeatedcv',                  
    number = 10,
    repeats = 10,
    savePredictions = 'final',
    verboseIter = FALSE,
    classProbs = TRUE,
 
) 



lda_fit = train(fracture ~ ., data=train_transformed, method="lda", trControl = fitControl)
print(lda_fit)
Linear Discriminant Analysis 

400 samples
 22 predictor
  2 classes: 'No', 'Yes' 

No pre-processing
Resampling: Cross-Validated (10 fold, repeated 10 times) 
Summary of sample sizes: 360, 360, 360, 360, 360, 360, ... 
Resampling results:

  Accuracy  Kappa    
  0.74675   0.1975245
preds_lda = make_predictions(lda_fit, train_transformed,train_transformed$fracture, "lda")
plot_roc("LDA",preds_lda,0.2,0.8,T)

classification_metrics(0.22, lda_fit, "LDA", train_transformed,train_transformed$fracture, "lda")
[1] "Confusion matrix for  LDA"
     y
class  No Yes
  No  206  33
  Yes  94  67
[1] "accuracy = 0.682"
[1] "precision = 0.416"
[1] "recall = 0.416"
[1] "F1 = 0.513"
preds_lda = make_predictions(lda_fit, test_transformed,test_transformed$fracture, "lda")
plot_roc("LDA",preds_lda,0.2,0.8,T)

classification_metrics(0.22, lda_fit, "LDA", test_transformed,test_transformed$fracture, "lda")
[1] "Confusion matrix for  LDA"
     y
class No Yes
  No  47  11
  Yes 28  14
[1] "accuracy = 0.61"
[1] "precision = 0.333"
[1] "recall = 0.333"
[1] "F1 = 0.418"
plot_roc("Baseline Lasso",preds_lasso,0.2,0.85,F, col="red")
par(new=T)
plot_roc("Complex Lasso",preds_ob2_lr,0.2,0.80,F, col="blue")
par(new=T)
plot_roc("Random Forrest",preds_rf,0.2,0.75,F, col="orange")
par(new=T)
plot_roc("LDA",preds_lda,0.2,0.7,F, col="green")
legend(0.7, 0.3,legend = c("Baseline Lasso","Complex Lasso", "Random Forrest", "LDA"), fill=c("red","blue","orange","green"))

---
title: "R Notebook"
output: html_notebook
---

This is an [R Markdown](http://rmarkdown.rstudio.com) Notebook. When you execute code within the notebook, the results appear beneath the code. 

Try executing this chunk by clicking the *Run* button within the chunk or by placing your cursor inside it and pressing *Cmd+Shift+Enter*. 

#Import Libraries
```{r message=FALSE, warning=FALSE}
library(aplore3)
library(caret)
library(dplyr)
library(tidyverse)
library(car)
require(ggthemes)
library(glmnet)
library(cowplot)
library(GGally)
library(ResourceSelection)
library(ROCR)
library(pROC)
library(doParallel)
library(qwraps2)
```


```{r}
cl <- makePSOCKcluster(7)
registerDoParallel(cl)

```

#Import Data
```{r}
data = glow_bonemed 
data = data.frame(data)
dim(data)
```

```{r}
data$sub_id = as.factor(data$sub_id)
data$site_id = as.factor(data$site_id)
data$phy_id = as.factor(data$phy_id)

```

#Split train and test set
```{r}
set.seed(66)
trainIndex <- createDataPartition(data$fracture, p = .8, 
                                  list = FALSE, 
                                  times = 1)
train <- data[trainIndex,]
test  <- data[-trainIndex,]
dim(train)
dim(test)
```

# Objective do EDA and Simple Model
# EDA


All of the EDA will be done in the train data

View head of dataframe
```{r}
head(train)
```
Looking at Fracture balance
```{r}
# look for class imbalance
# The dataset is hevaily imbalance with more No's than Yes

data_classes = data %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
train_classes = train %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
test_classes = test %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()

plot_grid(data_classes, train_classes, test_classes, labels = c("Overall Data", "Train Data", "Test Data"))

```


Let's look at pair plots from all the numeric variables
```{r}
train_numeric = train %>% select_if(is.numeric)
pairs(train[,2:8],col=as.factor(train$fracture))
```
Looking at a different view of pair plots for numerical variables. Excluding id's  
```{r message=FALSE, warning=FALSE}
ggpairs(train,columns=4:8,aes(colour=fracture))
```
Looking at box plot for different numerical variables per fracture or not
```{r}
boxplot_age = train %>% ggplot(aes(y=age, x=fracture)) + geom_boxplot() + ggtitle("age vs fracture") + theme_fivethirtyeight()

boxplot_weight = train %>% ggplot(aes(y=weight, x=fracture)) + geom_boxplot() + ggtitle("weight vs fracture")  + theme_fivethirtyeight()

boxplot_height = train %>% ggplot(aes(y=height, x=fracture)) + geom_boxplot() + ggtitle("height vs fracture") + theme_fivethirtyeight()

boxplot_bmi= train %>% ggplot(aes(y=bmi, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

boxplot_fracscore= train %>% ggplot(aes(y=fracscore, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

plot_grid(boxplot_age, boxplot_weight, boxplot_height, boxplot_bmi, boxplot_fracscore, nrow=2, ncol=2)
```
Lets look at bmi vs age per different categorical variables
```{r fig.height=10, fig.width=5}
# relation of bmi and age

age_bim_fracture = train %>% ggplot(aes(x=age, y=bmi, col=fracture)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_premeno = train %>% ggplot(aes(x=age, y=bmi, col=premeno)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_smoke = train %>% ggplot(aes(x=age, y=bmi, col=raterisk)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_raterisk = train %>% ggplot(aes(x=age, y=bmi, col=smoke)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

plot_grid(age_bim_fracture, age_bim_premeno,age_bim_smoke, age_bim_raterisk, nrow=4, ncol=1)

```

Lets look at different numerica variables vs categorical variables per site id
The point os to investigate if site id had any impact
```{r fig.height=5, fig.width=5, message=FALSE, warning=FALSE}
bmi_frac_type = train %>% ggplot(aes(x=fracture, y=bmi, col=as.factor(site_id))) + geom_boxplot() + ggtitle("BMI for fracture type per site id")

age_frac_type = train %>% ggplot(aes(x=fracture, y=age, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Age for fracture type per site id")

weight_frac_type = train %>% ggplot(aes(x=fracture, y=weight, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Weight for fracture type per site id")

height_frac_type = train %>% ggplot(aes(x=fracture, y=height, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Height for fracture type per site id")

plot_grid(bmi_frac_type, age_frac_type, weight_frac_type,height_frac_type, nrow=2, ncol=2)
```
```{r}
colnames(train)
```

```{r fig.height=10, fig.width=10}

options(qwraps2_markup = "markdown")
our_summary1 <-
  list("Age" =
       list("min"       = ~ min(age),
            "median"    = ~ median(age),
            "max"       = ~ max(age),
            "mean (sd)" = ~ qwraps2::mean_sd(age)),
       "Weight" =
       list("min"       = ~ min(weight),
            "median"    = ~ median(weight),
            "max"       = ~ max(weight),
            "mean (sd)" = ~ qwraps2::mean_sd(weight)),
       "Height" =
       list("min"       = ~ min(height),
            "median"    = ~ median(height),
            "max"       = ~ max(height),
            "mean (sd)" = ~ qwraps2::mean_sd(height)),
       "BMI" =
        list("min"       = ~ min(bmi),
             "median"    = ~ median(bmi),
                "max"       = ~ max(bmi),
                "mean (sd)" = ~ qwraps2::mean_sd(bmi)),
        "Frac Score" =
        list("min"       = ~ min(fracscore),
             "median"    = ~ median(fracscore),
                "max"       = ~ max(fracscore),
                "mean (sd)" = ~ qwraps2::mean_sd(fracscore))
       )

summary_table(train, our_summary1)
```
```{r}

our_summary1 <-
  list("Age" =
       list("min"       = ~ min(age),
            "median"    = ~ median(age),
            "max"       = ~ max(age),
            "mean (sd)" = ~ qwraps2::mean_sd(age)),
       "Weight" =
       list("min"       = ~ min(weight),
            "median"    = ~ median(weight),
            "max"       = ~ max(weight),
            "mean (sd)" = ~ qwraps2::mean_sd(weight)),
       "Height" =
       list("min"       = ~ min(height),
            "median"    = ~ median(height),
            "max"       = ~ max(height),
            "mean (sd)" = ~ qwraps2::mean_sd(height)),
       "BMI" =
        list("min"       = ~ min(bmi),
             "median"    = ~ median(bmi),
                "max"       = ~ max(bmi),
                "mean (sd)" = ~ qwraps2::mean_sd(bmi)),
        "Frac Score" =
        list("min"       = ~ min(fracscore),
             "median"    = ~ median(fracscore),
                "max"       = ~ max(fracscore),
                "mean (sd)" = ~ qwraps2::mean_sd(fracscore))
       )

summary_table(dplyr::group_by(train,fracture), our_summary1)

```
```{r}

options(qwraps2_markup = "markdown")
our_summary1 <-
  list("Age" =
       list("min"       = ~ min(age),
            "median"    = ~ median(age),
            "max"       = ~ max(age),
            "mean (sd)" = ~ qwraps2::mean_sd(age)),
       "Weight" =
       list("min"       = ~ min(weight),
            "median"    = ~ median(weight),
            "max"       = ~ max(weight),
            "mean (sd)" = ~ qwraps2::mean_sd(weight)),
       "Height" =
       list("min"       = ~ min(height),
            "median"    = ~ median(height),
            "max"       = ~ max(height),
            "mean (sd)" = ~ qwraps2::mean_sd(height)),
       "BMI" =
        list("min"       = ~ min(bmi),
             "median"    = ~ median(bmi),
                "max"       = ~ max(bmi),
                "mean (sd)" = ~ qwraps2::mean_sd(bmi))
       )

summary_table(train, our_summary1)
```



#Functions 
```{r}

fit_pred = function(model, x, y, m){
  if(m=="lasso"){
    fit.pred = predict(model, newx = x, type = "response")
    
  }
  if(m=="lda"){
     fit.pred= predict(model, x, type = "prob")
     fit.pred = fit.pred[,2]
  }
  
  if(m=="rf"){
     fit.pred= predict(model, x, type = "prob")
     fit.pred = fit.pred[,2]
  }
  
  if(m=="stepwise"){
    fit.pred = predict(model, newdata  = x, type = "response")

    
  }
  return(fit.pred)
  
}
make_predictions = function(model, x, y, m){
  
  fit.pred = fit_pred(model, x, y, m)
 
  
  
  results = prediction(fit.pred, y, 
                           label.ordering=c("No","Yes"))
  return(results)
}

classification_metrics = function(cutoff, model, model_type, x, y, m) {
  
  fit.pred = fit_pred(model, x, y, m)
 
  
  
  class<-factor(ifelse(fit.pred>cutoff,"Yes","No"),levels=c("No","Yes"))
  
  #Confusion Matrix for Lasso
  conf<-table(class,y)
  print(paste("Confusion matrix for ", model_type))
  print(conf)
  precision <- posPredValue(class, y, positive="Yes")
  recall <- sensitivity(class, y, positive="Yes")
  F1 <- (2 * precision * recall) / (precision + recall)
  print(paste("accuracy = ", round(mean(class==y) ,3), sep = ""))
  print(paste("precision = ", round(precision ,3), sep = ""))
  print(paste("recall = ", round(precision ,3), sep = ""))
  print(paste("F1 = ", round(F1 ,3), sep = ""))


}

roc_metrics = function(pred_results){
  
  roc = performance(pred_results, measure = "tpr", x.measure = "fpr")
  return(roc)
}

auc_metrics = function(pred_results) {
  auc <- performance(pred_results , measure = "auc")
  auc <- auc@y.values
  return(auc)
  
}
plot_roc = function (model_type, pred_results,x,y,c, ...) {
  roc = roc_metrics(pred_results)
  auc = auc_metrics(pred_results)
  plot(roc, colorize = c, ...)
  abline(a=0, b= 1)
  text(x = x, y = y, paste(model_type," AUC = ", round(auc[[1]],3), sep = ""))
}

```



# Build a new model

Lets train an interpretable logistic regression using the lasso technique
The point of this model is to be interpretable, meaning no exotic variables such as iteraction terms

```{r}
str(train)
```

```{r}

train.x <- model.matrix(fracture~  priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu, train)

train.y<-train[,15]


nFolds = 10 
set.seed(4)
foldid  = sample(rep(seq(nFolds), length.out = nrow(train.x)))
lambdas_to_try <- 10^seq(-5, 5, length.out = 2000)
set.seed(5)               
cvfit = cv.glmnet(train.x, train.y, 
                   family = "binomial", 
                  alpha=1,
                   type.measure = "auc", 
                   lambda = lambdas_to_try, 
                   nfolds = nFolds, 
                   foldid = foldid,
                  parallel = T
                  )

plot(cvfit)

coef(cvfit, s = "lambda.min")

print("CV AUC:")
cvfit$cvm[which(cvfit$lambda==cvfit$lambda.min)]

#Optimal penalty
print("Penalty Value:")
cvfit$lambda.min
```



build a final interpretable model based on feature selection and lambda value selected above
```{r}
#For final model predictions go ahead and refit lasso using entire
#data set
#finalmodel = glmnet(train.x, train.y, family = "binomial",lambda=cvfit$lambda.min)
finalmodel_lasso<-glmnet(train.x, train.y, 
                   family = "binomial", 
                  alpha=1,
                   lambda = cvfit$lambda.min ) 
summary(finalmodel_lasso)
coef(finalmodel_lasso)
finalmodel_lasso
```
```{r}
finalmodel<-glm(fracture ~  priorfrac + height + bmi + premeno + momfrac  +
                  smoke + raterisk + raterisk + fracscore  +
                  bonemed_fu 
                  , data=train,family = binomial(link="logit"))
coef(finalmodel)
confint(finalmodel)
summary(finalmodel)
```

```{r}
train.x <- model.matrix(fracture~  priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu, train)

train.y<-train[,15]
preds_lasso = make_predictions(finalmodel_lasso, train.x, train.y, "lasso")
plot_roc("Lasso",preds_lasso,0.2,0.7,T)
classification_metrics(0.22, finalmodel_lasso, "Lasso", train.x, train.y, "lasso")
```

```{r}

vif(finalmodel)
```


```{r}
plot(finalmodel)
```


lets look at predictions for the lasso model
also looking at the roc plot to select the most optimal threhold for classification


```{r}
hoslem.test(finalmodel$y, fitted(finalmodel), g=10)

```

There is a large p-value so the test is a fit

```{r}
test.x <- model.matrix(fracture~  priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu, test)

test.y<-test[,15]
preds_lasso = make_predictions(finalmodel_lasso, test.x, test.y, "lasso")
plot_roc("Lasso",preds_lasso,0.2,0.7,T)
classification_metrics(0.3, finalmodel_lasso, "Lasso", test.x, test.y, "lasso")

```

lets look at model performance metrics
```{r}


```





# Stepwise regression

```{r}
library(leaps)
nvmax = 14
reg_sq=regsubsets(fracture~.-sub_id-site_id-phy_id-bonetreat,data=train, method="seqrep", nvmax=nvmax)
```

```{r}
par(mfrow=c(2,2))
cp<-summary(reg_sq)$cp
plot(1:(nvmax),cp,type="l",ylab="CP",xlab="# of predictors")
index<-which(cp==min(cp))
points(index,cp[index],col="red",pch=10)
bics<-summary(reg_sq)$bic
plot(1:(nvmax),bics,type="l",ylab="BIC",xlab="# of predictors")
index<-which(bics==-0.05839447)
points(index,bics[index],col="red",pch=10)
adjr2<-summary(reg_sq)$adjr2
plot(1:(nvmax),adjr2,type="l",ylab="Adjusted R-squared",xlab="# of predictors")
index<-which(adjr2==max(adjr2))
points(index,adjr2[index],col="red",pch=10)
rss<-summary(reg_sq)$rss
plot(1:(nvmax),rss,type="l",ylab="train RSS",xlab="# of predictors")
index<-which(rss==min(rss))
points(index,rss[index],col="red",pch=10)
```

```{r}

cbind(CP=summary(reg_sq)$cp,
      r2=summary(reg_sq)$rsq,
      Adj_r2=summary(reg_sq)$adjr2,
      BIC=summary(reg_sq)$bic,
      RSS = summary(reg_sq)$rss)
```


```{r}
coef(reg_sq, 8)
summary.out <- summary(reg_sq)
which.max(summary.out$adjr2)
summary.out$which[8,]
```




```{r}
#To deal with the redundamcy, I would throw the cylinder variable out and then see what happens
model.main<-glm(fracture ~raterisk+weight+bmi+premeno+momfrac+fracscore+bonemed_fu+smoke, data=train,family = binomial(link="logit"))
summary(model.main)
exp(cbind("Odds ratio" = coef(model.main), confint.default(model.main, level = 0.95)))
vif(model.main)
```

```{r}
#Residual diagnostics can be obtained using
plot(model.main)
```
```{r}
train_select = subset(train, select = c(weight,bmi,premeno,momfrac,fracscore,bonemed_fu,smoke,raterisk,fracture))
preds_step = make_predictions(model.main, train_select,train_select$fracture, "stepwise")
plot_roc("Step",preds_step,0.2,0.8,T)
classification_metrics(0.22, model.main, "Step", train_select,train_select$fracture, "stepwise")

```

```{r}
test_select = subset(test, select = c(weight,bmi,premeno,momfrac,fracscore,bonemed_fu,smoke,raterisk,fracture))
preds_step = make_predictions(model.main, test_select,test_select$fracture, "stepwise")
plot_roc("Step",preds_step,0.2,0.8,T)
classification_metrics(0.22, model.main, "Step", test_select,test_select$fracture, "stepwise")
```
lets look at model performance metrics

```{r}

```

```{r}

plot_roc("Step",preds_step,0.2,0.8,F, col="red")
par(new=T)
plot_roc("Lasso",preds_lasso,0.2,0.7,F, col="blue")
legend(0.7, 0.3,legend = c("Step","Lasso"), fill=c("red","blue"))
```

Objective 2

```{r}
# Feature Eng

#Square numerical variables 
train$ageSquared = train$age**2
train$weightSquared = train$weight**2
train$heigthSquared = train$height**2
train$bmiSquared = train$bmi**2

#Cubic numerical variables
train$ageCubic = train$age**3
train$weightCubic = train$weight**3
train$heigthCubic = train$height**3
train$bmiCubic= train$bmi**3


#Square numerical variables 
test$ageSquared = test$age**2
test$weightSquared = test$weight**2
test$heigthSquared = test$height**2
test$bmiSquared = test$bmi**2

#Cubic numerical variables
test$ageCubic = test$age**3
test$weightCubic = test$weight**3
test$heigthCubic = test$height**3
test$bmiCubic= test$bmi**3


# drop cols
train = subset(train, select = -c(sub_id,site_id,phy_id))
test = subset(test, select = -c(sub_id,site_id,phy_id))


head(train)
```

```{r}
# Scale numeric variables

preProcValues = preProcess(train, method = c("scale"))
train_transformed <- predict(preProcValues, train)
test_transformed <- predict(preProcValues, test)
test_transformed



```

```{r}

train.x <- model.matrix(fracture~ .*. , train_transformed)

train.y<-train_transformed[,12]


nFolds = 10 
set.seed(3)
foldid  = sample(rep(seq(nFolds), length.out = nrow(train.x)))
lambdas_to_try <- 10^seq(-3, 5, length.out = 2000)
set.seed(3)               
cvfit = cv.glmnet(train.x, train.y, 
                   family = "binomial", 
                   type.measure = "class", 
                   lambda = lambdas_to_try, 
                   nfolds = nFolds, 
                   foldid = foldid)

plot(cvfit)

coef(cvfit, s = "lambda.min")

print("CV Error Rate:")
cvfit$cvm[which(cvfit$lambda==cvfit$lambda.min)]

#Optimal penalty
print("Penalty Value:")
cvfit$lambda.min

```

```{r message=FALSE, warning=FALSE}
finalmode_ob2 = glmnet(train.x, train.y, 
                   family = "binomial", 
                  alpha=1,
                   lambda = cvfit$lambda.min ) 
summary(finalmode_ob2)
coef(finalmode_ob2)
finalmodel_lasso
#coef(finalmode_ob2)
#confint(finalmode_ob2)
summary(finalmode_ob2)

```

```{r}
finalmode_ob2
```


```{r}
preds_ob2_lr = make_predictions(finalmode_ob2, train.x, train.y,"lasso")
plot_roc("Complex Lasso",preds_ob2_lr,0.2,0.8,T)
classification_metrics(0.30, finalmode_ob2, "Complex LR", train.x, train.y,"lasso")
```
```{r}
test.x <- model.matrix(fracture~ .*. , test_transformed)

test.y<-test_transformed[,12]
preds_ob2_lr = make_predictions(finalmode_ob2, test.x, test.y,"lasso")
plot_roc("Complex Lasso",preds_ob2_lr,0.2,0.8,T)
classification_metrics(0.20, finalmode_ob2, "Complex LR", test.x, test.y,"lasso")
```
```{r}
train
train_x = subset(train, select=-c(fracture))
train_x
```

# Build random forest model
```{r}
fitControl <- trainControl(
    method = 'repeatedcv',                  
    number = 10,
    repeats = 10,
    savePredictions = 'final',
    verboseIter = FALSE,
    classProbs = TRUE,
    search='grid'
) 

tunegrid <- expand.grid(.mtry = (1:15)) 

rpart_fit = train(fracture ~ ., data=train, method="rf", trControl = fitControl, tuneGrid = tunegrid)
print(rpart_fit)
```

```{r}


preds_rf = make_predictions(rpart_fit, train,train$fracture, "rf")
plot_roc("RF",preds_rf,0.2,0.8,T)
classification_metrics(0.5, rpart_fit, "Step", train,train$fracture, "rf")

```
```{r}


preds_rf = make_predictions(rpart_fit, test,test$fracture, "rf")
plot_roc("RF",preds_rf,0.2,0.8,T)
classification_metrics(0.22, rpart_fit, "RF", test,test$fracture, "rf")

```

```{r}
#library(MASS)
#library(pheatmap)
#fit.lda <- lda(fracture ~ ., data = train_transformed,  CV = TRUE)
#fit.lda


fitControl <- trainControl(
    method = 'repeatedcv',                  
    number = 10,
    repeats = 10,
    savePredictions = 'final',
    verboseIter = FALSE,
    classProbs = TRUE,
 
) 



lda_fit = train(fracture ~ ., data=train_transformed, method="lda", trControl = fitControl)
print(lda_fit)
```



```{r}
preds_lda = make_predictions(lda_fit, train_transformed,train_transformed$fracture, "lda")
plot_roc("LDA",preds_lda,0.2,0.8,T)
classification_metrics(0.22, lda_fit, "LDA", train_transformed,train_transformed$fracture, "lda")
```


```{r}
preds_lda = make_predictions(lda_fit, test_transformed,test_transformed$fracture, "lda")
plot_roc("LDA",preds_lda,0.2,0.8,T)
classification_metrics(0.22, lda_fit, "LDA", test_transformed,test_transformed$fracture, "lda")
```
```{r}
plot_roc("Baseline Lasso",preds_lasso,0.2,0.85,F, col="red")
par(new=T)
plot_roc("Complex Lasso",preds_ob2_lr,0.2,0.80,F, col="blue")
par(new=T)
plot_roc("Random Forrest",preds_rf,0.2,0.75,F, col="orange")
par(new=T)
plot_roc("LDA",preds_lda,0.2,0.7,F, col="green")
legend(0.7, 0.3,legend = c("Baseline Lasso","Complex Lasso", "Random Forrest", "LDA"), fill=c("red","blue","orange","green"))
```